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Judging by the reaction of techreport.com to AMD's policy for this products release, I don't think this exact sort of thing happens very often.

The large review sites are generally bought and paid for, maybe techreport has tipped its hand or maybe they just aren't often privy to giving previews whilst under NDA but anandtech didn't seem as bothered. Theres a reason why you're supposed to consult a number of review sites before you consider yourself informed.